| article html file updated | 6 February 2020 09:55 CET | Update | https://www.mdpi.com/2077-0375/4/2/257 |
| article html file updated | 7 May 2019 13:13 CEST | Update | - |
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| article html file updated | 20 August 2015 09:44 CEST | Update | - |
| article html file updated | 8 July 2014 10:35 CEST | Original file | - |
| article xml file uploaded | 8 July 2014 10:35 CEST | Original file | https://www.mdpi.com/2077-0375/4/2/257/xml |
| article pdf uploaded. | 12 June 2014 15:15 CEST | Version of Record | https://www.mdpi.com/2077-0375/4/2/257/pdf |
